My 890 has a bunch of unresponsive buttons. Mainly ones at the top left and right. The 4 small rectangular ones on either side of the lcd screen.

When I take it apart and press the metal foil bubbles with my finger nail, they work. I tried puttin some double sides tape overtop the bubble, very small rectangles and only peel the tape off on the bottom, so the top portion of the tape isn't sticky. This helped quite a bit, but some are still hard to press. Anymore ideas?